Forum Discussion
Evaluate row value to measure - simple example
Hi,
Im trying to evaluate each column value agaisnt the measure but cant seem to figure out why it is struggling.
A very simple 1 column table (Test);
Number
---------
1
2
3
4
5
6
7
8
9
10
Measure = STDEV.P(Test[Number]) - which gives a Standard deviation value of 2.87
I have now a calculated column that checks to see iff each of the values in the number column is greater than or less than the Standard Deviation calculated in the measure using this formula;
LogicalTest = IF(Test[Number]<[Measure], "Less", "Greater")
But the resulting table looks like this;
Why is it evaluating each row value as "Greater"? Surely values 1 and 2 should show "Less"
See the PBI file below:
https://www.dropbox.com/s/kyrfej1luf8uwan/MeasureVsColumn.pbix?dl=0
- Usually, measures adapt according to the scope it is used for, so it will change to the standard deviation of the current row being evaluated and will always give an incorrect result. To overcome this you need to fix the calculation to estimate the value over all the values in the column. Use this one: STD = calculate(STDEV.P(Table1[Number]),ALL(Table1[Number])) Then do your check against this measure.
5 Replies
- Usually, measures adapt according to the scope it is used for, so it will change to the standard deviation of the current row being evaluated and will always give an incorrect result. To overcome this you need to fix the calculation to estimate the value over all the values in the column. Use this one: STD = calculate(STDEV.P(Table1[Number]),ALL(Table1[Number])) Then do your check against this measure.
Anonymous
Measures transform row context to Filter context
So your STDEV.P gets calculated for each individual row in above formulaTry
LogicalTest = IF(Test[Number]<STDEV.P(Test[Number]), "Less", "Greater")
Anonymous
If you want to keep the original measure you can use
LogicalTest_ = IF(Test[Number]<CALCULATE([Measure],ALL(Test)), "Less", "Greater")
